<html>
<head>
	<meta charset="UTF-8">
	<meta content="IE=edge" http-equiv="X-UA-Compatible">
	<meta content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no, width=device-width" name="viewport">
	<title>2824：[AHOI2012]铁盘整理</title>
	<!-- css -->
	<link href="../css/base.min.css" rel="stylesheet">
	<link href="../css/project.min.css" rel="stylesheet">
	
	<!-- favicon -->
	<!-- ... -->
</head>
<body class="page-brand">
	<header class="header header-transparent header-waterfall ui-header">
		<ul class="nav nav-list pull-left">
			<li>
				<a data-toggle="menu" href="#menu">
					<span class="icon icon-lg">menu</span>
				</a>
			</li>
		</ul>
		<a class="header-logo header-affix-hide margin-left-no margin-right-no" data-offset-top="213" data-spy="affix">[AHOI2012]铁盘整理</a>
		<span class="header-logo header-affix margin-left-no margin-right-no" data-offset-top="213" data-spy="affix">[AHOI2012]铁盘整理</span>
	</header>
	<nav aria-hidden="true" class="menu" id="menu" tabindex="-1">
		<div class="menu-scroll">
			<div class="menu-content">
				<a class="menu-logo" href="../index.html">BZOJ离线题库</a>
				<ul class="nav">
					<li>
						<a class="waves-attach" data-toggle="collapse" href="#problems">题目</a>
						<ul class="menu-collapse collapse in" id="problems">
							<li>
								<a class="waves-attach" href="../index.html">主页</a>
							</li>
							<li>
								<a class="waves-attach" href="../list.html">题目列表</a>
							</li>
						</ul>
					</li>
					<li>
						<a class="collapsed waves-attach" data-toggle="collapse" href="#about">关于</a>
						<ul class="menu-collapse collapse" id="about">
							<li>
								<a class="waves-attach" href="../about.html">关于此项目</a>
							</li>
						</ul>
					</li>
					
				</ul>
			</div>
		</div>
	</nav>
	<main class="content">
		<div class="content-header ui-content-header">
			<div class="container">
				<h1 class="content-heading">
                [AHOI2012]铁盘整理                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
		</div>
		<div class="container">
			<section class="content-inner margin-top-no">
				<div class="row">
					<div class="col-lg-13 col-md-13">
						<div class="card margin-bottom-no">
							<div class="card-main">
								<div class="card-inner">
									
                                <h3>题目描述</h3><p><div style="margin: 0cm 50.05pt 0pt 17.9pt; line-height: 23.4pt"><span style="font-size: 12pt; color: black">在训练中，一些臂力训练器材是少不了的，小龙在练习的时候发现举重器械</span><span style="font-size: 12pt; color: black">上的铁盘放置的非常混乱，并没有按照从轻到重的顺序摆放，这样非常不利于循</span><span style="font-size: 12pt; color: black">序渐进的锻炼。他打算利用一个非常省力气的办法来整理这些铁盘，即每次都拿</span><span style="font-size: 12pt; color: black">起最上面的若干个圆盘并利用器械的力量上下翻转，这样翻转若干次以后，铁盘</span><span style="font-size: 12pt; color: black">将会按照从小到大的顺序排列好。那么你能不能帮小龙确定，最少翻转几次就可</span><span style="font-size: 12pt; color: black">以使铁盘按从小到大排序呢？</span></div>
<p><span style="font-size: 12pt; color: black">例如：下面的铁盘经过如图</span><span style="font-size: 12pt; color: black">2.1</span><span style="font-size: 12pt; color: black">所示的以下几个步骤的翻转后变为从小到大</span><span style="font-size: 12pt; color: black">排列。</span></p>
<p></p>
<p><img height="450" width="773" alt="" src="../file/2824_0.jpg" /></p></p><hr/><h3>输入格式</h3><p><p class="MsoNormal" align="left" style="margin: 7.5pt -3.75pt 0pt 17.9pt; line-height: 13.5pt; text-align: left; mso-line-height-rule: exactly; mso-layout-grid-align: none; tab-stops: 212.8pt"><span style="font-size: 12pt; color: black; font-family: 宋体; mso-ascii-font-family: 'Courier New'; mso-hansi-font-family: 'Courier New'; mso-font-kerning: 0pt">共两行，第一行为铁盘个数</span><span lang="EN-US" style="font-size: 12pt; color: black; font-family: &quot;Courier New&quot;; mso-font-kerning: 0pt; mso-bidi-font-family: 'Times New Roman'">N</span><span style="font-size: 12pt; color: black; font-family: 宋体; mso-ascii-font-family: 'Courier New'; mso-hansi-font-family: 'Courier New'; mso-font-kerning: 0pt">（</span><span lang="EN-US" style="font-size: 11pt; color: black; font-family: &quot;Courier New&quot;; mso-font-kerning: 0pt; mso-bidi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt">1&le;N&le;50</span><span style="font-size: 12pt; color: black; font-family: 宋体; mso-ascii-font-family: 'Courier New'; mso-hansi-font-family: 'Courier New'; mso-font-kerning: 0pt">）。第二行为</span><span lang="EN-US" style="font-size: 12pt; color: black; font-family: &quot;Courier New&quot;; mso-font-kerning: 0pt; mso-bidi-font-family: 'Times New Roman'">N</span><span style="font-size: 12pt; color: black; font-family: 宋体; mso-ascii-font-family: 'Courier New'; mso-hansi-font-family: 'Courier New'; mso-font-kerning: 0pt">个不同的正整数（中</span><span style="font-size: 12pt; color: black; font-family: 宋体; mso-ascii-font-family: 'Courier New'; mso-hansi-font-family: 'Courier New'; mso-font-kerning: 0pt">间用空格分开），分别为从上到下的铁盘的半径</span><span lang="EN-US" style="font-size: 11pt; color: black; mso-font-kerning: 0pt; mso-bidi-font-size: 12.0pt"><font face="Times New Roman"><span style="mso-tab-count: 1">&nbsp;&nbsp; </span>R</font></span><span style="font-size: 12pt; color: black; font-family: 宋体; mso-ascii-font-family: 'Courier New'; mso-hansi-font-family: 'Courier New'; mso-font-kerning: 0pt">（</span><span lang="EN-US" style="font-size: 11pt; color: black; mso-font-kerning: 0pt; mso-bidi-font-size: 12.0pt"><font face="Times New Roman">1</font></span><span lang="EN-US" style="font-size: 11pt; color: black; font-family: &quot;Courier New&quot;; mso-font-kerning: 0pt; mso-bidi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt">&le;</span><span lang="EN-US" style="font-size: 11pt; color: black; mso-font-kerning: 0pt; mso-bidi-font-size: 12.0pt"><font face="Times New Roman">R</font></span><span lang="EN-US" style="font-size: 11pt; color: black; font-family: &quot;Courier New&quot;; mso-font-kerning: 0pt; mso-bidi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt">&le;</span><span lang="EN-US" style="font-size: 11pt; color: black; mso-font-kerning: 0pt; mso-bidi-font-size: 12.0pt"><font face="Times New Roman">100</font></span><span style="font-size: 11pt; color: black; font-family: 宋体; mso-ascii-font-family: 'Courier New'; mso-hansi-font-family: 'Courier New'; mso-font-kerning: 0pt; mso-bidi-font-size: 12.0pt">）</span></p></p><hr/><h3>输出格式</h3><p><p><span style="font-size: 12pt; color: black; font-family: 'Courier New'; mso-font-kerning: 0pt; mso-bidi-font-family: 'Times New Roman'">&nbsp;</span><span style="font-size: 12pt; color: black; font-family: 宋体; mso-ascii-font-family: 'Courier New'; mso-hansi-font-family: 'Courier New'; mso-font-kerning: 0pt">一个正整数，表示使铁盘按从小到大有序需要的最少翻转次数。</span><span lang="EN-US" style="font-size: 12pt; color: black; font-family: 'Courier New'; mso-font-kerning: 0pt; mso-bidi-font-family: 'Times New Roman'"> <o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin: 0cm -1.1pt 0pt 0cm; line-height: 10pt; text-align: left; mso-line-height-rule: exactly; mso-layout-grid-align: none"><span lang="EN-US" style="font-size: 10pt; color: black; mso-font-kerning: 0pt; mso-bidi-font-size: 12.0pt"><font face="Times New Roman"><o:p></o:p></font></span></p>
<p class="MsoNormal" align="left" style="margin: 11.5pt -3.75pt 0pt 41.9pt; line-height: 13.5pt; text-align: left; mso-line-height-rule: exactly; mso-layout-grid-align: none"></p></p><hr/><h3>样例输入</h3><pre>5 
2  4 3 5 1
</pre><hr/><h3>样例输出</h3><pre>5 
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>没有写明来源</p>
								</div>
							</div>
						</div>
					</div>
				</div>
				
				
			</section>
		</div>
	</main>

	<div class="fbtn-container">
		<div class="fbtn-inner">
			<a class="fbtn fbtn-lg fbtn-brand-accent waves-attach waves-circle waves-light waves-effect" data-toggle="dropdown" aria-expanded="true"><span class="fbtn-text fbtn-text-left">Menu</span><span class="fbtn-ori icon">apps</span><span class="fbtn-sub icon">close</span></a>
			<div class="fbtn-dropup">
				<a class="fbtn fbtn-brand waves-attach waves-circle waves-light waves-effect" href="../list.html" target="_self"><span class="fbtn-text fbtn-text-left">题目列表</span><span class="icon">menu</span></a>
				<a class="fbtn fbtn-green waves-attach waves-circle waves-effect" href="../index.html" target="_self"><span class="fbtn-text fbtn-text-left">返回主页</span><span class="icon">home</span></a>
				<a class="fbtn waves-attach waves-circle waves-effect" href="http://www.lydsy.com/JudgeOnline/submitpage.php?id=2824" target="_blank"><span class="fbtn-text fbtn-text-left">提交代码</span><span class="icon">send</span></a>
				<a class="fbtn fbtn-orange waves-attach waves-circle waves-effect" href="http://www.lydsy.com/JudgeOnline/wttl/wttl.php?pid=2824" target="_blank"><span class="fbtn-text fbtn-text-left">试题讨论</span><span class="icon">chat</span></a>
				
			</div>
		</div>
	</div>

	<!-- js -->
	<script src="../js/jquery.min.js"></script>
	<script src="../js/base.min.js"></script>
	<script src="../js/project.min.js"></script>
</body>
</html>